class Age():
    def __get__(self, instance, owner):
        # print("get")
        return instance.v

    def __set__(self, instance, value):
        # print("set", self, instance, value)
        instance.v = value

    # def __delete__(self, instance):
    #     print("delete")
    #     del instance.v

    def __getattr__(self):
      return None

class Person():
    age = Age()

p1 = Person()
print('++++')

p1.age = 10
print(p1.age)
# # del p.age
#
p2 = Person()
p2.age = 11
print(p2.age)
print(p1.age)

# print(Person.age)